Rotary engine.



PATENTED JULY 31, 1906.

T. T. BEVAN. ROTARY ENGINE.

APPLICATION FILED 00124. 1906.

THE NDRRI' ,n slis cm, WASHINGTON, n c.

UNITED STATES PATENT OFFICE.

ROTARY ENGINE.

Specification of Letters Patent. I

Application filed October 24, 1905. Serial No. 284,154.

Patented July 31 1906.

the object of this invention is to provide a perfectly-balanced engineof this type, the efliciency of which will be higher than that realizedfrom a steam or gas engine.

'My invention aims to provide a rotary en-' gine having less cylinderwear, occupying less floor-space, and more eq ually balanced thanengines heretofore devised; and with these and many other objects inview which will more readily appear as the nature of the invention isbetter understood the same consists in the novel construction,combination, and arrangement of parts, to be hereinafter more fullydescribed and claimed.

Referring to the drawings accompanying this application, like numeralsof reference designate corresponding parts throughout the several views,in which Figure 1 is a plan of my improved engine. Fig. 2 is a sideelevation. Fig. 3 is an end view. Fig. 4 is a cross-sectional view ofthe engine. Fig. 5 is a horizontal sectional view taken on a horizontalplane extending through the steam-chest and on an enlarged scale, andFig. 6 is an enlarged fragmentary sectional view of a portion of thecylinder of the engine.

To put my invention into practice, I construct my improved engine of abody portion 1, having a central annular bore 2, which forms thecylinder of the engine. The body portion 1 is provided with heads 3 3,and journaled in these heads and extending through the bore or cylinder2 is a shaft 4, adapted to be driven by steam admitted to the engine.Upon the shaft 4 is mounted a cylinder-head 5 of a less diameter thanthe bore or cylinder 2 of the engine. The shaft 4, which extends throughthe bore or c linder 2, is mounted above the longitudinal axis of thecylinder,

, as clearly illustrated in Fig. 4 of the drawings,

and when the head 5 is mounted upon the shaft the periphery of the headis adapted to normally engage the top of the bore or cylinder 2, forminga crescent-shaped compartment between the head and the body 1 of theengine. The ends of the head are cut away, as at 6 6, and surroundingthe shaft 4 within the cutaway ends of the head are mounted stationaryeccentrics 7 7 and 8 8. These eccentrics are surrounded byeccentric-straps 7 7 and 8 8, respectively, and these straps areconnected, as at 9, to the ends of blades 10 10, mounted diametricallyopposite one another in the head 5. The head is. provided withdiametrically-opposed recesses 11 11 to accommodate the blades, and byreferring to Fig. 4 of the drawings it Wlll be observed that these re:

cesses are substantially wedge-shapedthat is, the rear wall of eachrecess being of a greater area than the opening of said recesses.

The openings 12 12 of said recesses are con-- tracted, and the sldes ofthe head adjacent to the openings are provided with substantiallysemicylindrical bearing-blocks 14 14. These blocks, which move in thesides of the head-,- are provided with lubricating-blocks 15 1'5 and 1616, said blocks preferably being formed of graphite. In case it isdesired not to use a lubricant in this connection Babbitt metal may besubstituted for the blocks 15 and 16.

Upon the top of the body portion 1 are formed two steam-chests 17 and18, a pipe 19 communicating with the steam-chest 17 in order that steammaybefed to said chest, while a pipe 20 leads from the steam-chest 18 inorder that the steam may be exhausted there-- through. The steam-chest17 communicates with the cylinder or bore 2 by two ports 21 21, whichlead to one side of the cylinder adjacent to each end thereof, whileanother set of ports 22 lead to the opposite side of the cylinder ateach end thereof. When the engine is running in one direction, the ports21 serve as inlet-ports, while the ports 22 serve as exhaust-ports, andvice versa, when the engine is reversed. Controlling the ports 21 and 22in the steam-chest 17 is a piston-head 23, which is mounted upon apiston 24, that extends without the steam-chest. The piston 24 isconnected by a link 25 with a bellcrank lever 26, pivoted upon the endof the head 3 of the engine. The bell-crank lever 26 is connected to aneccentric 27, that is carried by the shaft 4. Also controlling the inletand exhaust ports are slide-valves 28, these slide-valves being providedwith openings 29 and 30, said openings being adapted to alternatelyregister with the ports 2] and 22. The slide-valves are connected bylinks 31 31, connected to a lever 32, which is pivotally mounted, as at33, 'upon a protuberance 34, carried by the side of the engine.

In operation when steam is admitted through the inlet-ports 21 21 theblades 10 upon one side of. the head will be forced around in thecrescent-shaped compartment formed between the head 5 and the walls ofthe cylinder. As the blade is carried, around, carrying with it the head5, the outer edges of the blades are normally held in engagement withthe Walls of the cylinder or bore 2 by the eccentrics mounted upon theshaft 4, and in order that one blade may recede during the outwardmovement of the other the eccentrics are reversely arranged upon theshaft 4. WVhile one blade is taking steam from the inlet-port the steamin the rear of the opposite blade will exhaust through the port 22, andas this operation is continuous the head 5 willbe revolved, carryingwith it the shaft 4, and this driven'shaft is adapted to operate theeccentric 27 and through the medium of the bell-crank lever 26 actuatethe piston 23, which will govern the inlet and exhaust ports of theengine. Should it be desired to reverse the engine, the lever 32 ismanipulated to reverse the ports 21 and 22, this being accomplished byproviding said ports with a common by-path 35, the admission and exhaustof steam to the same being controlled by the piston mounted in thesteam-chest 17.

It will of course be understood that a conventional form of packing isused at various places throughout the construction of my improvedengine, especially in connection with the stuffing-boxes 36 36, carriedby the heads 3 3, stuffing-box 37, carried by steamchest 17, andstuffing-boxes 38 38, carried by the engine adjacent to the slide-valves28.

It is thought from the foregoing that the construction, operation, andadvantages of the herein-described rotary engine will be apparentwithout further description, and various changes in the form,proportion, and minor details of construction may be resorted to withoutdeparting from the spirit of the invention or sacrificing any of theadvantages thereof.

What I claim, and desire to secure by Letters Patent, is-

1. An engine of the type described embodying a bodyportion having aplurality of bores formed therein, heads carried by said body portion,steam-chests carried by said eccentrics surrounding said shaft,eccentricnected to said blades to alternately actuate said blades, meansto alternately open and close the inlet-ports, and means to reverse theinlet and outlet ports, substantially as described.

2. An engine of the type described embodying a body portion having aplurality of bores formed therein, a shaft extending through both saidbores, two heads carried by said shaft, blades mounted in each saidhead, said body portion having ports formed therein, a stationaryeccentric arranged in each bore ofthe body portion and surrounding theshaft and an eccentric-strap surrounding each eccentric and connected tothe said blades, substantially as described.

3. In a rotary engine the combination of a body portion having a bore ateach end and a head at each end, said body portion having twosteam-chests communicating respectively with the bores at the oppositeends of the bod portion; with a shaft extending through botli said headsand both said bores, a movable head arranged in each bore of the bodyportion, said heads being carried by said shaft, a stationary eccentricarranged in each bore, amovable eccentric-strap surrounding eacheccentric, ra dially-disposed blades carried by each eccen-. trio-strap,valves mounted in said steamchests and governing each a plurality ofports leading respectively to said bores, and slide-valves arrangedintermediate the steamchests and the bores, said slide-valves beingadapted to alternately open and close each of the ports leading from thesteam-chests to the bore.

In testimony whereof I affix my signature in the presence oftwoiwitnesses.

Witnesses:

H. O. EVERT, E. E. POTTER.

THOMAS T. BEVAN.

' straps surrounding said eccentrics and con--

